| 1. |
- Aartsen, M. G., et al.
(författare)
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The IceCube Neutrino Observatory : instrumentation and online systems
- 2017
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Ingår i: Journal of Instrumentation. - : IOP PUBLISHING LTD. - 1748-0221 .- 1748-0221. ; 12
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Tidskriftsartikel (refereegranskat)abstract
- The IceCube Neutrino Observatory is a cubic-kilometer-scale high-energy neutrino detector built into the ice at the South Pole. Construction of IceCube, the largest neutrino detector built to date, was completed in 2011 and enabled the discovery of high-energy astrophysical neutrinos. We describe here the design, production, and calibration of the IceCube digital optical module (DOM), the cable systems, computing hardware, and our methodology for drilling and deployment. We also describe the online triggering and data filtering systems that select candidate neutrino and cosmic ray events for analysis. Due to a rigorous pre-deployment protocol, 98.4% of the DOMs in the deep ice are operating and collecting data. IceCube routinely achieves a detector uptime of 99% by emphasizing software stability and monitoring. Detector operations have been stable since construction was completed, and the detector is expected to operate at least until the end of the next decade.
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| 2. |
- Abbasi, R., et al.
(författare)
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Measurement of acoustic attenuation in South Pole ice
- 2011
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Ingår i: Astroparticle physics. - : Elsevier BV. - 0927-6505 .- 1873-2852. ; 34:6, s. 382-393
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Tidskriftsartikel (refereegranskat)abstract
- Using the South Pole Acoustic Test Setup (SPATS) and a retrievable transmitter deployed in holes drilled for the IceCube experiment, we have measured the attenuation of acoustic signals by South Pole ice at depths between 190 m and 500 m. Three data sets, using different acoustic sources, have been analyzed and give consistent results. The method with the smallest systematic uncertainties yields an amplitude attenuation coefficient alpha = 3.20 +/- 0.57 km(-1) between 10 and 30 kHz, considerably larger than previous theoretical estimates. Expressed as an attenuation length, the analyses give a consistent result for lambda equivalent to 1/alpha of similar to 300 m with 20% uncertainty. No significant depth or frequency dependence has been found.
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| 3. |
- Abbasi, R., et al.
(författare)
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Search for neutrino lines from dark matter annihilation and decay with IceCube
- 2023
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Ingår i: Physical Review D. - : American Physical Society. - 2470-0010 .- 2470-0029. ; 108:10
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Tidskriftsartikel (refereegranskat)abstract
- Dark matter particles in the Galactic Center and halo can annihilate or decay into a pair of neutrinos producing a monochromatic flux of neutrinos. The spectral feature of this signal is unique and it is not expected from any astrophysical production mechanism. Its observation would constitute a dark matter smoking gun signal. We performed the first dedicated search with a neutrino telescope for such signal, by looking at both the angular and energy information of the neutrino events. To this end, a total of five years of IceCube's DeepCore data has been used to test dark matter masses ranging from 10 GeV to 40 TeV. No significant neutrino excess was found and upper limits on the annihilation cross section, as well as lower limits on the dark matter lifetime, were set. The limits reached are of the order of 10-24 cm3/s for an annihilation and up to 1027 s for decaying dark matter. Using the same data sample we also derive limits for dark matter annihilation or decay into a pair of Standard Model charged particles.
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| 4. |
- Aboagye, Emmanuel, et al.
(författare)
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Exhaustion and Impaired Work Performance in the Workplace : Associations With Presenteeism and Absenteeism
- 2019
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Ingår i: Journal of Occupational and Environmental Medicine. - : Wolters Kluwer. - 1076-2752 .- 1536-5948. ; 61:11, s. 438-444
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Tidskriftsartikel (refereegranskat)abstract
- Objective: The aim of this study was to investigate the association between presenteeism and absenteeism during the previous year and the current levels of exhaustion and impaired work performance in a Swedish university setting.Methods: In a study of 3525 employees, an ordinal logistic regression and general linear model was used to examine the association between presenteeism and absenteeism during the previous year and the current exhaustion and impaired work performance, respectively.Results: Presenteeism, but not absenteeism, during the previous year independently increased the risk of having moderate or severe exhaustion. Presenteeism, absenteeism, and exhaustion remained positively associated with impaired work performance when health status and other confounders had been adjusted for.Conclusions: Presenteeism, but not absenteeism, was associated with exhaustion. Both presenteeism and absenteeism were the salient correlates of impaired work performance.
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| 5. |
- Aboagye, Emmanuel, et al.
(författare)
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What is Number of Days in Number of Times? : Associations Between, and Responsiveness of, Two Sickness Presenteeism Measures
- 2020
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Ingår i: Journal of Occupational and Environmental Medicine. - : Wolters Kluwer. - 1076-2752 .- 1536-5948. ; 62:5, s. e180-e185
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Tidskriftsartikel (refereegranskat)abstract
- Objective: To examine the associations between sickness presenteeism (SP) reported as number of days with SP reported as number of times and to evaluate their responsiveness.Methods: The study population (n = 454) consisted of employed individuals, at risk of long-term sickness absence. Correlation analyses were performed to examine associations between the two SP measures and external constructs such as work performance, general health, and registered sick leave. Both SP constructs were measured several times to examine responsiveness.Results: The SP measures are moderately correlated. They moderately correlated with work performance and health status measures. SP reported as number of times seems to be more sensitive than number of days in detecting changes after rehabilitation.Conclusions: Numerical or categorical constructs are valid sources of data on SP. However, categorized SP seems to be more responsive.
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| 6. |
- Aronsson, Gunnar, 1943-, et al.
(författare)
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Arbetsvillkor, återhämtning och hälsa - en studie av förskola. hemtjänst och socialtjänst
- 2010
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- Studiens övergripande syfte var att undersöka arbetsförhållanden som är förknippade med ackumulering av stress och bristande återhämtning och att studera hur återhämtning är relaterat till hälsoaspekter. Studiegruppen var anställda inom förskola, hemtjänst och socialtjänst och kom från två relativt stora kommuner (n =193). Återhämtning eller brist på återhämtning antogs vara en betydelsefull förmedlande länk mellan arbetsvillkor och hälsa/ohälsa och sjukfrånvaro. Datainsamling skedde genom en enkät och den totala svarsfrekvensen var 79 %. En klusteranalys gav tre kluster "Återhämtade“ och “Ej återhämtade“ är yttergrupper, som omfattar 36 respektive 25 procent av totalgruppen medan mellangruppen utgjorde 39 procent. Gruppen ej återhämtade får ses som en riskgrupp för ohälsa. Gruppen uppvisar hela kedjan av riskfaktorer – problematiska arbetsvillkor på vilka de svarar med ökad ansträngning och kompenserande strategier. Trots betydligt högre ohälsorapportering har de inte högre sjukfrånvaro, vilket sannolikt hör samman med att de ersätter sjukfrånvaro med sjuknärvaro. I socialtjänsten är det hela 43 procent som tillhör den ej återhämtade gruppen. Regressionsanalyser med kontroll för bakgrundsvariabler visar att den icke återhämtade gruppen hade en signifikant högre relativ risk för sämre självskattad hälsa än personer i den återhämtade gruppen. Ännu kraftigare riskökningar fanns för de fem symtom som därutöver analyserades. Avslutningsvis diskuteras praktiska slutsatser och nya forskningsfrågor.
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| 7. |
- Aronsson, Gunnar, et al.
(författare)
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Conclusions
- 2009
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Ingår i: Validation and test of central concepts in positive work and organizational psychology. - Köpenhamn : Nordic Council of Ministers. - 9789289319195 ; , s. 93-96
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Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- Within working life research there has been a long and strong tradition of focusing on risks, problems, diseases, and other negative aspects of the work environment. Modern reflexive social systems and organizations incorporate, internalize, and apply this knowledge, which creates new conditions for research and reflexivity, and so forth. There are similar processes on the individual level – people reflect and internalize knowledge which changes their perceptions, cognitions and action strategies. In that way our societies have gained much knowledge about what work conditions should be avoided or eliminated. In the Nordic welfare states, as in many other countries, there exists thinking and politics which hold that work should offer something more than an activity one does for money. According to this view, work should contribute to individual satisfaction, personal development, occupational skills, health, etc. On the road to a more individualized and health and development oriented working life there is need for a research perspective that generates knowledge on how to form “healthy work” and “healthy workplaces”. The positive psychology movement is an inspirational source for occupational psychology to move in that direction and a positive occupational psychology perspective is not in conflict with the traditional and established work psychology or disease model – the role is rather to contribute to a new working life research front with a strong potential for generating knowledge for preventive measures. The Nordic welfare states, with their view that work should contribute to personal growth and health, should have a special interest in research and knowledge for such a development.
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| 8. |
- Aronsson, Gunnar, et al.
(författare)
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Relationship between a long-term health measure and self-rated health and symptoms in the Swedish working population
- 2009
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Ingår i: Validation and test of central concepts in positive work and organizational psychology. - Köpenhamn : Nordic Council of Ministers. - 9789289319195 ; , s. 59-63
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Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- The purpose of the study was to construct a measure of good long-term health based on sickness absenteeism (SA)/sickness presenteeism (SP) and to investigate its relationship to self-rated health and self-reported symptoms. The analyses were performed on data from three Swedish projects with representative samples but with some differences in the subjects’ age and type of employment. The result show clear relationships between the measure of long-term health and self-ratings of health and investigated self-reported symptoms. There are differences in the absolute level of self-rated health in the three datasets, but these may be ascribed to differences in the rating scales and distributions. The most interesting result is that the rank for the three sets of data is the same. Of the two intermediate categories, the group with high sickness presenteeism/low sickness absenteeism seems to have a somewhat more problematic health situation than the group with low sickness presenteeism/high sickness absenteeism.
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| 9. |
- Aronsson, Gunnar, et al.
(författare)
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Samband mellan sjuknärvaro, sjukfrånvaro och självskattad hälsa i den yrkesaktiva befolkningen
- 2009
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Rapport (populärvet., debatt m.m.)abstract
- Samband mellan sjuknärvaro respektive sjukfrånvaro och hälsa undersöktes i fem svenska datamaterial (n=425-3622), från perioden 1992-2005. Syftet var att jämföra storleken på sambanden mellan sjuknärvaro respektive sjukfrånvaro och självskattad hälsa samt om dessa är betingade av arbetsorganisatoriska och ekonomiska förhållanden. Resultaten visade nästan undantagslöst signifikanta samband mellan sjuknärvaro och sjukfrånvaro respektive självskattad hälsa med högre samband mellan sjuknärvaro och hälsa. Stegvisa logistiska regressionsanalyser visade att självskattad hälsa i ett av materialen predicerades av en kombination av sjuknärvaro och sjukfrånvaro med en förklarad varians på 25,7 procent. I multipla logistiska regressionsanalyser steg oddskvoterna på ett regelbundet sätt för både sjuknärvaro och sjukfrånvaro med de högsta oddskvoterna för sjuknärvaro. Det framkom inte någon interaktionseffekt mellan de två måtten. Ju mer svårersättlig (höga närvarokrav) en individ är desto starkare är sambandet sjuknärvaro och självskattad hälsa. För sjukfrånvaro och hälsa gällde istället att sambandet var högre i gruppen som hade ersättbara arbetsuppgifter. Sjuknärvaro visade även högre samband med ohälsa än sjukfrånvaro bland individer med dålig privatekonomisk situation. Avslutningsvis diskuteras värdet av ett kombinerat sjuknärvaro- och sjukfrånvaromått och om vissa grupper i arbetslivet har sämre hälsa än vad sjukfrånvaromåttet indikerar.
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| 10. |
- Aronsson, Gunnar, et al.
(författare)
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Sickness presence, sickness absence, and self-reported health and symptoms
- 2011
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Ingår i: International Journal of Workplace Health Management. - : Emerald Group Publishing Limited. - 1753-8351 .- 1753-836X. ; 4:3, s. 228-243
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Tidskriftsartikel (refereegranskat)abstract
- Purpose - The purpose of this paper is to compare sickness presence (SP) and sickness absence (SA) regarding the strength of their relationship to health/ill-health. In a previous Canadian study a stronger association between SP and health/ill-health than between SA and health/ill-health was shown.Design/methodology/approach - Five Swedish data sets from the years 1992 to 2005 provided the study populations, including both representative samples and specific occupational groups (n=425-3,622). Univariate correlations and multiple logistic regression analyses were performed. The data sets contained questions on SP and SA as well as on various health complaints and, in some cases, self-rated health (SRH).Findings - The general trend was that correlations and odds ratios increased regularly for both SP and SA, with SP showing the highest values. In one data set, SRH was predicted by a combination of the two measures, with an explained variance of 25 percent. Stratified analyses showed that the more irreplaceable an individual is at work, the larger is the difference in correlation size between SP and SA with regard to SRH. SP also showed an accentuated and stronger association with SRH than SA among individuals reporting poor economic circumstances.Practical implications - The results support the notion that SA is an insufficient, and even misleading, measure of health status for certain groups in the labor market, which seem to have poorer health than the measure of SA would indicate.Orginality/value - A combined measure of sickness presence and absence may be worth considering as an indicator of both individual and organizational health status.
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